code: def _download(url, filename):
      """Download a url to a file in the JAX data temp directory."""
      if not path.exists(_DATA):
          os.makedirs(_DATA)
      out_file = path.join(_DATA, filename)
      if not path.isfile(out_file):
          urlretrieve(url, out_file)
          print("downloaded {} to {}".format(url, _DATA))
  
file_path: cleverhans/tutorials/torch/datasets.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import array
  import gzip
  import os
  from os import path
  import struct
  from six.moves.urllib.request import urlretrieve
  import numpy
  import torch
label_desc: Use image node_id 1 for calling a global function with example usage: _download(url, filename) without return types